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  • 1
    Electronic Resource
    Electronic Resource
    Microstructural study of Nd-doped LiTaO3 (1995)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 67 (1995), S. 2450-2452 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: X-ray diffraction, infrared, and Raman spectra of Nd-doped LiTaO3 (LT:Nd) were examined. X-ray diffraction patterns of the x and y faces display the appearance of new diffraction peaks and the existence of microtwin crystals, indicating the microstructural deviation from a trigonal system of pure LT crystal. Infrared transmission spectrum shows more than seven strong vibrational bands in the high frequency region 1500–6000 cm−1. Their intensities and frequencies hardly change after annealing the sample at high temperature. We attribute these bands to the existence of defects and some metal and organic complexes in the sample. Similar results were obtained from the Raman spectra. In addition, the transmitted polarized light photomicrograph of the Z face of LT:Nd displays the occurrence of a helix dislocation. All experimental results indicate that the microstructural imperfection of LT:Nd can lead to some new optical effects. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.114604
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  • 2
    Electronic Resource
    Electronic Resource
    Replication-incompetent adenoviral vaccine vector elicits effective anti-immunodeficiency-virus immunity (2002)
    [s.l.] : Macmillian Magazines Ltd.
    Nature 415 (2002), S. 331-335 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Recent studies of human immunodeficiency virus type 1 (HIV-1) infection in humans and of simian immunodeficiency virus (SIV) in rhesus monkeys have shown that resolution of the acute viral infection and control of the subsequent persistent infection are mediated by the antiviral cellular immune ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/415331a
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  • 3
    Electronic Resource
    Electronic Resource
    Biology of Allothrombium pulvinum Ewing (Acari: Trombidiidae) in West Mazandran, Iran (1996)
    Springer
    Experimental and applied acarology 20 (1996), S. 137-142 
    Details
    ISSN: 1572-9702
    Keywords: Life history ; predator ; parasite ; aphids ; Allothrombium pulvinum ; Acari
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Allothrombium pulvinum Ewing is a common natural enemy of aphids and other arthropods in Iran. It is univoltine in Iran. The eggs hatch in spring, nymphs emerge in early summer and adults appear in autumn. Larvae are ectoparasites of aphids whereas deutonymphs and adults are free-living predators of aphids and spider mites. Adults hibernate in the soil and in cracks of tree trunks during winter. When spring comes, females lay eggs in the soil, on the soil surface and on weeds. Phytoseius plumifer (Phytoseiidae) was observed to be phoretic on deutonymphs of A. pulvinum on nettle trees (Celtis australis). In the laboratory, development from the egg to adult stage takes at least 107 days at 25±1°C. Soil is not essential for female oviposition. High humidity is the most important factor for oviposition and development in A. pulvinum.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00051479
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  • 4
    Electronic Resource
    Electronic Resource
    Patterns, mechanisms and spatial scale of aggregation in generalist and specialist predatory mites (Acari: Phytoseiidae) (1997)
    Springer
    Experimental and applied acarology 21 (1997), S. 393-404 
    Details
    ISSN: 1572-9702
    Keywords: Foraging behaviour ; searching efficiency ; predator–prey interaction ; specialization
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Prey species often distribute themselves patchily in their habitats.In response to this spatial variation in prey density, some predator speciesaggregate in patches of higher prey density. This paper reviews a seriesof laboratory experiments to demonstrate the patterns of responses byphytoseiid predators (Phytoseiulus persimilis, Typhlodromusoccidentalis and Amblyseius andersoni) to spatial variationin the density of their spider mite prey (Tetranychus urticae)and reveal the behavioural mechanisms underlying the observed patterns.In addition, patterns of aggregation were examined at a variety of spatialscales on plants in greenhouses. The patterns, mechanisms and spatialscale of aggregation in three predatory species are discussed in relationto their varying degrees of polyphagy. The results show that a specialistpredator species (1) aggregates more strongly than generalist predators,(2) does so not because it finds prey patches of high density more easilybut because it remains in these patches longer than generalist predatorsand (3) tends to aggregate more often at lower levels of spatial scalethan generalist predators. It is suggested that these conclusions, basedmainly on laboratory studies of a small sample of species, should be testedin the future on a wider selection of specialist and generalist speciesat different scales in the field.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1018475728005
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  • 5
    Electronic Resource
    Electronic Resource
    Researches of acarology in China (1992)
    Springer
    Experimental and applied acarology 16 (1992), S. 277-278 
    Details
    ISSN: 1572-9702
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01193810
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  • 6
    Electronic Resource
    Electronic Resource
    Arrestment response of the predatory mite Amblyseius longispinosus to Schizotetranychus nanjingensis webnests on bamboo leaves (Acari: Phytoseiidae, Tetranychidae) (2000)
    Springer
    Experimental and applied acarology 24 (2000), S. 227-233 
    Details
    ISSN: 1572-9702
    Keywords: arrestment ; behaviour ; predator-prey interaction ; spider mites
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The response of the predatory mite Amblyseius longispinosus (Acari: Phytoseiidae) to the webnest of the spider mite nanjingensis (Acari: Tetranychidae) was examined using two-choice tests in the laboratory. A. longispinosus females were found significantly more often on leaves with webnests than on leaves without webnests and were often observed searching under the webbing. Because spider mites and their eggs were removed from the webnests before experiments, predators responded to stimuli associated with webbing, mite feeding damage and other residues in the webnests.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1006384723313
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  • 7
    Electronic Resource
    Electronic Resource
    Biology ofAllothrombium pulvinum (Acariformes: Trombidiidae), a potential biological control agent of aphids in China (1989)
    Springer
    Experimental and applied acarology 6 (1989), S. 101-108 
    Details
    ISSN: 1572-9702
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Allothrombium pulvinum Ewing is a common natural enemy of aphids and other small arthropods in China. It is univoltine species. The eggs hatch in spring, nymphs emerge in early summer, and adults emerge in autumn. Larvae are ectoparasites of aphids, whereas deutonymphs and adults are free-living predators of aphids, spider mites and some lepidopterous eggs. Adults hibernate in soil during winter and females lay their eggs in spring. In the laboratory the duration of immature stages is 74 days at 20–30°C. Larvae kill their host within 1–3 days when the mite load of the host is 2 or more. They decrease the reproductive rate of adult aphids and arrest the development of early-instar aphid nymphs when the mite load is 1. Larvae are capable of controlling the host population growth when the level of parasitism is high. Owing to its wide occurrence,A. pulvinum could be a potential candidate in the biological control of aphids. It is suggested that its impact on the host pest be evaluated in IPM programs in the future.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01201641
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  • 8
    Electronic Resource
    Electronic Resource
    Parasitism ofAphis gossypii (Homoptera: Aphididae) byAllothrombium pulvinum larvae (Acari: Trombidiidae) in cotton fields: spatial dispersion and density dependence (1993)
    Springer
    Experimental and applied acarology 17 (1993), S. 905-912 
    Details
    ISSN: 1572-9702
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Spatial aspects of the interaction between the aphid host,Aphis gossypii, and its parasite,Allo-thrombium pulvinum larvae, on cotton plants were examined in seven fields in China. For both the host and the parasite, sample variance increased with the mean according to Taylor's power law, which explained a substantial proportion (84–97%) of the variation in the data. Although both the host and parasite showed aggregated distribution on cotton plants, the host aphids aggregated more strongly than the parasites. The host dispersion pattern was not significantly affected by the presence of parasites. Increasing the spatial scales of observation from individual plot to the entire field also had no significant effects on host and parasite dispersion patterns. Parasites aggregated in cotton plants with higher aphid densities in five out of the seventeen samples. Spatial patterns of parasitism were mostly host density-independent (71% of the samples) and sometimes inversely density-dependent (29% of the sample). The processes underlying these patterns were discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02328067
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  • 9
    Electronic Resource
    Electronic Resource
    Technology of Redevelop and Intelligent Reconfiguration Oriented to Open CNC System (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 532-533 (Dec. 2006), p. 837-840 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: With the increase of expanded functions, Open CNC system is getting overstuffedgradually, which leads to the decrease of flexibility and reliability. Also, it is hard for users todefine their special functions of CNC system. The paper proposes a strategy of intelligentreconfiguration based on floating hierarchical structure. The stepwise control structure of CNCsystem is broken and a reticular structure is built. Each function unit is assigned a code-arrayrepresenting its layer levels. By changing values of the code-arrays, the system adjusts layerlevels of the function units to adapt change of external environment. Redundant structure andtechnology of switch circuit are applied to establish internal structure of function unit. Technologyof redevelop based on self-conducted configuration and structured language description is putforward. Strategies of simulation and evaluation are applied to prevent the CNC system frombeing damaged by improper redevelop
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/14/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.532-533.837.pdf
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  • 10
    Electronic Resource
    Electronic Resource
    Determination of Splitting Force in Process of Fracture Splitting Connecting Rod (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 324-325 (Nov. 2006), p. 97-100 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Splitting force is the key to the process of fracture splitting connecting rod. In this paper,numerical simulation is made in the process of fracture splitting Jetta car connecting rod by usingsoftware MSC.MARC. Through analysis, the curve between J integral and splitting force isestablished. According to the experiential formula of impact toughness and fracture toughness,critical J integral ( JIC ) can be achieved. After getting JIC , the splitting force can be determined bylinear interpolation method and verified by tensile experiment and the error is below 1%. It isproved that this method can also used to analyze other kinds of connecting rods with differentmaterials
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/52/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.324-325.97.pdf
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